1. Consider the following statements :In water supply distribution network, 1. the grid-iron system requires more length of pipe lines and larger number of cut-off valves.2. the design of the grid-iron system is difficult but economical.3. employing a grid-iron system, the dead ends are completely eliminated.4. employing a grid-iron system permits more water to be diverted towards the affected point from various directions.Which of the statements given above are correct ?
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